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<article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:ali="http://www.niso.org/schemas/ali/1.0/" article-type="research-article" dtd-version="1.2" xml:lang="en"><front><journal-meta><journal-id journal-id-type="publisher-id">Russian Journal of Infection and Immunity</journal-id><journal-title-group><journal-title xml:lang="en">Russian Journal of Infection and Immunity</journal-title><trans-title-group xml:lang="ru"><trans-title>Инфекция и иммунитет</trans-title></trans-title-group></journal-title-group><issn publication-format="print">2220-7619</issn><issn publication-format="electronic">2313-7398</issn><publisher><publisher-name xml:lang="en">SPb RAACI</publisher-name></publisher></journal-meta><article-meta><article-id pub-id-type="publisher-id">2065</article-id><article-id pub-id-type="doi">10.15789/2220-7619-VAL-2065</article-id><article-categories><subj-group subj-group-type="toc-heading" xml:lang="en"><subject>ORIGINAL ARTICLES</subject></subj-group><subj-group subj-group-type="toc-heading" xml:lang="ru"><subject>ОРИГИНАЛЬНЫЕ СТАТЬИ</subject></subj-group><subj-group subj-group-type="article-type"><subject>Research Article</subject></subj-group></article-categories><title-group><article-title xml:lang="en">Antiviral properties of verdazyls and leucoverdazyls and their activity against group B enteroviruses</article-title><trans-title-group xml:lang="ru"><trans-title>Противовирусные свойства вердазилов и лейковердазилов и их активность в отношении энтеровирусов группы B</trans-title></trans-title-group></title-group><contrib-group><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Volobueva</surname><given-names>Aleksandrina S.</given-names></name><name xml:lang="ru"><surname>Волобуева</surname><given-names>Александрина Сергеевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Researcher, Laboratory of Experimental Virology</p></bio><bio xml:lang="ru"><p>научный сотрудник лаборатории экспериментальной вирусологии</p></bio><email>sasha-khrupina@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Zarubaev</surname><given-names>Vladimir V.</given-names></name><name xml:lang="ru"><surname>Зарубаев</surname><given-names>Владимир Викторович</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Biology), Senior Researcher, Laboratory of Experimental Virology</p></bio><bio xml:lang="ru"><p>д.б.н., старший научный сотрудник лаборатории экспериментальной вирусологии</p></bio><email>sasha-khrupina@mail.ru</email><xref ref-type="aff" rid="aff1"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Fedorchenko</surname><given-names>Tatyana G.</given-names></name><name xml:lang="ru"><surname>Федорченко</surname><given-names>Татьяна Геннадьевна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>PhD (Chemistry), Researcher, Laboratory of Coordination Compounds</p></bio><bio xml:lang="ru"><p>к.х.н., научный сотрудник лаборатории координационных соединений</p></bio><email>sasha-khrupina@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Lipunova</surname><given-names>Galina N.</given-names></name><name xml:lang="ru"><surname>Липунова</surname><given-names>Галина Николавна</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>DSc (Chemistry), Leading Researcher, Laboratory of coordination compounds</p></bio><bio xml:lang="ru"><p>д.х.н., профессор, ведущий научный сотрудник</p></bio><email>sasha-khrupina@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Tungusov</surname><given-names>Vladislav N.</given-names></name><name xml:lang="ru"><surname>Тунгусов</surname><given-names>Владислав Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>Student</p></bio><bio xml:lang="ru"><p>студент</p></bio><email>sasha-khrupina@mail.ru</email><xref ref-type="aff" rid="aff3"/></contrib><contrib contrib-type="author"><name-alternatives><name xml:lang="en"><surname>Chupakhin</surname><given-names>Oleg N.</given-names></name><name xml:lang="ru"><surname>Чупахин</surname><given-names>Олег Николаевич</given-names></name></name-alternatives><address><country country="RU">Russian Federation</country></address><bio xml:lang="en"><p>RAS Full Member, DSc (Chemistry), Head of the Laboratory of Coordination Compounds</p></bio><bio xml:lang="ru"><p>академик РАН, д.х.н., зав. лабораторией координационных соединений</p></bio><email>sasha-khrupina@mail.ru</email><xref ref-type="aff" rid="aff2"/></contrib></contrib-group><aff-alternatives id="aff1"><aff><institution xml:lang="en">St. Petersburg Pasteur Institute</institution></aff><aff><institution xml:lang="ru">ФБУН НИИ эпидемиологии и микробиологии имени Пастера</institution></aff></aff-alternatives><aff-alternatives id="aff2"><aff><institution xml:lang="en">Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences</institution></aff><aff><institution xml:lang="ru">Институт органического синтеза им. И.Я. Постовского УрO РАН</institution></aff></aff-alternatives><aff-alternatives id="aff3"><aff><institution xml:lang="en">The Ural Federal University named after the first President of Russia B.N. Yeltsin</institution></aff><aff><institution xml:lang="ru">Уральский федеральный университет имени первого Президента России Б.Н. Ельцина</institution></aff></aff-alternatives><pub-date date-type="preprint" iso-8601-date="2023-02-13" publication-format="electronic"><day>13</day><month>02</month><year>2023</year></pub-date><pub-date date-type="pub" iso-8601-date="2023-04-01" publication-format="electronic"><day>01</day><month>04</month><year>2023</year></pub-date><volume>13</volume><issue>1</issue><issue-title xml:lang="en"/><issue-title xml:lang="ru"/><fpage>107</fpage><lpage>118</lpage><history><date date-type="received" iso-8601-date="2022-11-08"><day>08</day><month>11</month><year>2022</year></date><date date-type="accepted" iso-8601-date="2023-02-12"><day>12</day><month>02</month><year>2023</year></date></history><permissions><copyright-statement xml:lang="en">Copyright ©; 2023, Volobueva A.S., Zarubaev V.V., Fedorchenko T.G., Lipunova G.N., Tungusov V.N., Chupakhin O.N.</copyright-statement><copyright-statement xml:lang="ru">Copyright ©; 2023, Волобуева А.С., Зарубаев В.В., Федорченко Т.Г., Липунова Г.Н., Тунгусов В.Н., Чупахин О.Н.</copyright-statement><copyright-year>2023</copyright-year><copyright-holder xml:lang="en">Volobueva A.S., Zarubaev V.V., Fedorchenko T.G., Lipunova G.N., Tungusov V.N., Chupakhin O.N.</copyright-holder><copyright-holder xml:lang="ru">Волобуева А.С., Зарубаев В.В., Федорченко Т.Г., Липунова Г.Н., Тунгусов В.Н., Чупахин О.Н.</copyright-holder><ali:free_to_read xmlns:ali="http://www.niso.org/schemas/ali/1.0/"/><license><ali:license_ref xmlns:ali="http://www.niso.org/schemas/ali/1.0/">https://creativecommons.org/licenses/by/4.0</ali:license_ref></license></permissions><self-uri xlink:href="https://iimmun.ru/iimm/article/view/2065">https://iimmun.ru/iimm/article/view/2065</self-uri><abstract xml:lang="en"><p>Enteroviruses are non-enveloped viruses of <italic>Enterovirus</italic> genus, <italic>Picornaviridae</italic> family, causing a variety of human diseases: from acute respiratory and intestinal infections to more severe pathologies including poliomyelitis, encephalitis, myocarditis, pancreatitis. Currently, no approved direct-acting antiviral drugs for treatment of enterovirus infections exists, whereas vaccination is available only for prevention of poliomyelitis and enterovirus 71 infection. Therefore, it is promising to conduct a search for inhibitors of enteroviruses life cycle in drug development to treat enterovirus infections. Here, antiviral properties of stable free radicals, verdazyls, and their precursors, leucoverdazyls, were investigated. It has been shown that leucoverdazyls vs verdazyls increased the survival of permissive cell culture infected with coxsackievirus. The activity range of the lead leucoverdazyl against RNA-containing and DNA-containing human viruses (in the viral yield reduction assay) and its proposed mechanism of action (time of addition assay) was studied. The lead compound suppressed reproduction of group B enteroviruses <italic>in vitro</italic>, with modest activity against influenza A virus and no activity against herpes virus type 1 and adenovirus type 5. The maximum decrease in viral titers was observed upon its addition to infected cells during early and middle stages of the virus life cycle. Thus, we concluded that the studied compound has a pronounced inhibitory activity against group B enteroviruses not belonging to the class of capsid binder inhibitors, without virucidal properties. Previously, we described antioxidant properties of leucoverdazyls. It is known that many viral infections are accompanied by production of reactive oxygen species and oxidative stress, and some compounds with antioxidant properties exhibit antiviral potential. Targeted chemical modifications of leucoverdazyls and further studies of leucoverdazyl mechanism of action as well as <italic>in vivo</italic> animal studies are needed. However, the results obtained may be useful for future development of new antiviral drugs to treat enteroviral infections.</p></abstract><trans-abstract xml:lang="ru"><p>Энтеровирусы — группа безоболочечных вирусов рода <italic>Enterovirus</italic> семейства <italic>Picornaviridae</italic>, вызывающих разнообразные заболевания человека: от острых респираторных и кишечных до более тяжелых, включая полиомиелит, энцефалит, миокардит, панкреатит. На сегодняшний день отсутствуют зарегистрированные противовирусные препараты прямого действия для терапии энтеровирусных инфекций, вакцинация доступна только для профилактики полиомиелита и инфекции, вызванной энтеровирусом 71. Перспективен поиск молекул — ингибиторов жизненного цикла энтеровирусов для разработки новых лекарственных средств для терапии энтеровирусных инфекций. В данной работе были исследованы противовирусные свойства стабильных свободных радикалов — вердазилов, и их предшественников — лейковердазилов. Было показано, что лейковердазилы, в отличие от вердазилов, способны повышать выживаемость пермиссивной клеточной культуры при инфицировании вирусом Коксаки. Был исследован спектр активности соединения-лидера в отношении РНК-содержащих и ДНК-содержащих вирусов человека (методом снижения титра вирусного потомства) и его предполагаемый механизм действия (в тесте на время добавления исследуемого соединения). Соединение-лидер мощно подавляло репродукцию энтеровирусов группы В <italic>in vitro</italic>, обладало слабой активностью в отношении вируса гриппа А, при этом активность в отношении вируса герпеса 1 типа и аденовируса 5 типа отсутствовала. Наблюдалось максимальное снижение вирусных титров при добавлении этого соединения к инфицированным клеткам на ранних и средних стадиях жизненного цикла вируса. Таким образом, заключили, что исследованное соединение обладает выраженной ингибирующей активностью в отношении энтеровирусов группы В, при этом оно не относится к классу ингибиторов связывания капсида (в отличие от вещества сравнения плеконарила) и не проявляет вирулицидных свойств. Ранее были описаны антиоксидантные свойства лейковердазилов. Известно, что многие вирусные инфекции сопровождаются образованием активных форм кислорода и окислительным стрессом, а ряд соединений с антиоксидантными свойствами обладают противовирусным потенциалом. Необходимо расширить библиотеку лейковердазилов за счет направленных химических модификаций, выполнить дальнейшие исследования механизма действия лейковердазилов и исследования <italic>in vivo</italic> на животных моделях энтеровирусных инфекций. Тем не менее результаты исследования могут быть полезными для будущей разработки новых противовирусных препаратов для терапии энтеровирусной инфекции.</p></trans-abstract><kwd-group xml:lang="en"><kwd>Enteroviruses</kwd><kwd>enteroviral infection</kwd><kwd>Coxsackievirus</kwd><kwd>verdazyles</kwd><kwd>leucoverdazyles</kwd><kwd>antiviral activity</kwd><kwd>antioxidants</kwd></kwd-group><kwd-group xml:lang="ru"><kwd>энтеровирусы</kwd><kwd>энтеровирусная инфекция</kwd><kwd>коксакивирус</kwd><kwd>вердазилы</kwd><kwd>лейковердазилы</kwd><kwd>противовирусная активность</kwd><kwd>антиоксиданты</kwd></kwd-group><funding-group><award-group><funding-source><institution-wrap><institution xml:lang="en">The St. Petersburg Pasteur Institute</institution></institution-wrap><institution-wrap><institution xml:lang="ru">ФБУН НИИ эпидемиологии и микробиологии имени Пастера</institution></institution-wrap></funding-source></award-group></funding-group></article-meta></front><body></body><back><ref-list><ref id="B1"><label>1.</label><mixed-citation>Волобуева А.С., Зарубаев В.В., Ланцева К.С. 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